Cache recipes in Matter Entangler

src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/matter/MatterEntanglerBlockEntity.kt

@@ -1,13 +1,18 @@
 package ru.dbotthepony.mc.otm.block.entity.matter
 
+import com.github.benmanes.caffeine.cache.Cache
+import com.github.benmanes.caffeine.cache.Caffeine
+import com.github.benmanes.caffeine.cache.Scheduler
 import com.mojang.serialization.Codec
 import com.mojang.serialization.codecs.RecordCodecBuilder
+import net.minecraft.Util
 import net.minecraft.core.BlockPos
 import net.minecraft.world.entity.player.Inventory
 import net.minecraft.world.entity.player.Player
 import net.minecraft.world.inventory.AbstractContainerMenu
 import net.minecraft.world.item.ItemStack
 import net.minecraft.world.item.crafting.CraftingInput
+import net.minecraft.world.item.crafting.RecipeManager
 import net.minecraft.world.level.Level
 import net.minecraft.world.level.block.state.BlockState
 import net.neoforged.neoforge.capabilities.Capabilities
@@ -28,13 +33,21 @@ import ru.dbotthepony.mc.otm.container.IEnhancedCraftingContainer
 import ru.dbotthepony.mc.otm.container.slotted.AutomationFilters
 import ru.dbotthepony.mc.otm.container.slotted.FilteredContainerSlot
 import ru.dbotthepony.mc.otm.container.slotted.SlottedContainer
+import ru.dbotthepony.mc.otm.core.collect.filter
+import ru.dbotthepony.mc.otm.core.collect.forEach
+import ru.dbotthepony.mc.otm.core.collect.map
+import ru.dbotthepony.mc.otm.core.collect.toList
 import ru.dbotthepony.mc.otm.core.math.Decimal
+import ru.dbotthepony.mc.otm.core.util.ItemStackKey
+import ru.dbotthepony.mc.otm.core.util.asKey
 import ru.dbotthepony.mc.otm.data.codec.DecimalCodec
 import ru.dbotthepony.mc.otm.data.codec.minRange
 import ru.dbotthepony.mc.otm.graph.matter.MatterNode
 import ru.dbotthepony.mc.otm.menu.matter.MatterEntanglerMenu
+import ru.dbotthepony.mc.otm.recipe.IMatterEntanglerRecipe
 import ru.dbotthepony.mc.otm.registry.game.MBlockEntities
 import ru.dbotthepony.mc.otm.registry.game.MRecipes
+import java.time.Duration
 
 class MatterEntanglerBlockEntity(blockPos: BlockPos, blockState: BlockState) : MatteryWorkerBlockEntity<MatterEntanglerBlockEntity.Job>(MBlockEntities.MATTER_ENTANGLER, blockPos, blockState, Job.CODEC) {
 	class Job(itemStack: ItemStack, val matter: Decimal, ticks: Double, experience: Float) : ItemJob(itemStack, ticks, MachinesConfig.MATTER_ENTANGLER.energyConsumption, experience = experience) {
@@ -60,20 +73,47 @@ class MatterEntanglerBlockEntity(blockPos: BlockPos, blockState: BlockState) : M
 	val experience = ExperienceStorage(MachinesConfig.MATTER_ENTANGLER::maxExperienceStored).also(::addNeighbourListener)
 	val energyConfig = ConfigurableEnergy(energy)
 
+	private var recipeCache: Collection<IMatterEntanglerRecipe> = listOf()
+	private var seenRecipeManager: RecipeManager? = null
+
+	private fun getRecipes(): Collection<IMatterEntanglerRecipe> {
+		val level = level!!
+		val manager = level.recipeManager
+
+		if (seenRecipeManager !== manager) {
+			seenRecipeManager = manager
+			val input = inputs.asPositionedCraftInput()
+
+			recipeCache = manager.byType(MRecipes.MATTER_ENTANGLER)
+				.iterator()
+				.map { it.value }
+				.filter { it.preemptivelyMatches(input, level, 3, 3) }
+				.toList()
+		}
+
+		return recipeCache
+	}
+
 	private inner class InputSlot(container: SlottedContainer, slot: Int) : FilteredContainerSlot(container, slot) {
+		val insertCache: Cache<ItemStackKey, Boolean> = Caffeine.newBuilder()
+			.maximumSize(1024L)
+			.expireAfterWrite(Duration.ofMinutes(1L))
+			.scheduler(Scheduler.systemScheduler())
+			.executor(Util.backgroundExecutor())
+			.build()
+
 		override fun canAutomationPlaceItem(itemStack: ItemStack): Boolean {
 			if (!super.canAutomationPlaceItem(itemStack))
 				return false
 
 			val level = level ?: return false
-			val list = container.toList()
-			list[slot] = itemStack
-			val shadow = CraftingInput.ofPositioned(3, 3, list)
 
-			return level
-				.recipeManager
-				.byType(MRecipes.MATTER_ENTANGLER)
-				.any { it.value.preemptivelyMatches(shadow, level, 3, 3) }
+			return insertCache.get(itemStack.asKey()) {
+				val list = container.toList()
+				list[slot] = itemStack
+				val shadow = CraftingInput.ofPositioned(3, 3, list)
+				getRecipes().any { it.preemptivelyMatches(shadow, level, 3, 3) }
+			}
 		}
 
 		override fun canAutomationTakeItem(desired: Int): Boolean {
@@ -84,7 +124,14 @@ class MatterEntanglerBlockEntity(blockPos: BlockPos, blockState: BlockState) : M
 			get() = 1
 	}
 
-	val inputs = IEnhancedCraftingContainer.Wrapper(SlottedContainer.simple(3 * 3, ::InputSlot, ::setChanged), 3, 3)
+	private fun inputsChanged() {
+		inputs.slotIterator().forEach { (it as InputSlot).insertCache.invalidateAll() }
+		seenRecipeManager = null
+		recipeCache = listOf()
+		setChanged()
+	}
+
+	val inputs = IEnhancedCraftingContainer.Wrapper(SlottedContainer.simple(3 * 3, ::InputSlot, ::inputsChanged), 3, 3)
 	val output = SlottedContainer.simple(1, AutomationFilters.ONLY_OUT.unlimitedSimpleProvider, ::markDirtyFast)
 
 	val itemConfig = ConfigurableItemHandler(

src/main/kotlin/ru/dbotthepony/mc/otm/core/util/ItemStackKey.kt

@@ -0,0 +1,35 @@
+package ru.dbotthepony.mc.otm.core.util
+
+import it.unimi.dsi.fastutil.HashCommon
+import net.minecraft.core.component.DataComponentMap
+import net.minecraft.world.item.Item
+import net.minecraft.world.item.ItemStack
+
+class ItemStackKey(val item: Item, val components: DataComponentMap) {
+	// make copy of original itemstack because there is no copy() method on DataComponentMap, which is returned by ItemStack#getComponents
+	constructor(itemStack: ItemStack) : this(itemStack.item, itemStack.copy().components)
+
+	private var hashComputed = false
+	private var hash = 0
+
+	override fun equals(other: Any?): Boolean {
+		return this === other || other is ItemStackKey && other.item === item && other.components == components
+	}
+
+	override fun hashCode(): Int {
+		if (!hashComputed) {
+			hash = HashCommon.murmurHash3(item.hashCode().toLong().shl(32) or components.hashCode().toLong()).toInt()
+			hashComputed = true
+		}
+
+		return hash
+	}
+
+	override fun toString(): String {
+		return "ItemStackKey[$item, $components]"
+	}
+}
+
+fun ItemStack.asKey(): ItemStackKey {
+	return ItemStackKey(this)
+}